<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .active {
        color: red;
      }
    </style>
  </head>

  <body>
    <div id="app"></div>
    <template id="pengfan">
      <div :class="['abc',title]">哈哈哈</div>
      <div :class="['abc',title,isActive ? 'active': '']">哈哈哈</div>
      <div :class="['abc',title, {active: isActive}]">哈哈哈</div>
    </template>
    <script src="../js/vue.js"></script>
    <script>
      Vue.createApp({
        template: "#pengfan",
        data() {
          return {
            message: "Hello World",
            title: "cba",
            isActive: true,
          };
        },
        methods: {},
      }).mount("#app");
    </script>
  </body>
</html>
